purpose, dynamically set line-height according to div height
use line-height to center the text vertically, but the div height changes dynamically
/ / Please paste the code text below (do not replace the code with pictures)
listens for div height changes. When height changes, get div height, and dynamically assign values to line-height
Vertical centering with other (unset line-height) schemes
//
//css
div {
display: flex;
align-items: center;
height: 200px;
border: 1px solid red;
}
//html
<div>
<span>123</span>
</div>
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